.avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.avatar-uploader .el-upload:hover {
    border-color: #409EFF;
}
.avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
}
.avatar {
    width: 178px;
    height: 178px;
    display: block;
}
.back{
    background-image:  url("../assets/back.jpg") ;
    /* 让背景图基于容器大小伸缩 */
    background-size: cover;
    width: 1900px;
    height: 100%;
}
ul {
    margin: 0;
    padding: 0;
    display: block;
}
div {
    padding: 0;
}
el-carousel-item  h3 img{
    width: 100%;
    height: 100%;
}